Corn Belt derecho: Difference between revisions
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==Impact== |
==Impact== |
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[[File:Velocity data for June 29, 98jun Corn Belt Derecho over Central Illinois.gif|thumb|Radar velocity display across southeastern Iowa into far western Illinois at 3:51 p.m. CDT, June 29, 1998.]] |
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By the end of the morning, the thunderstorms produced hail up to the size of hen's eggs and locally damaging wind in Nebraska. By mid-day, supercells along the [[bow echo]] in Iowa began to produce very strong winds, up to tennis ball-sized hail, and several mostly short-lived tornadoes.<ref name=Corfidi/> On [[Weather radar#Velocity|Doppler weather radar]], a large fast-moving [[mesocyclone]] associated of the track of a [[supercell]] was nearly in contact with the ground as it moved from southwest [[Boone County, Iowa|Boone County]] east-southeast across the northern and eastern parts of the [[Des Moines metropolitan area|Des Moines metro area]].<ref name=Corfidi/> |
By the end of the morning, the thunderstorms produced hail up to the size of hen's eggs and locally damaging wind in Nebraska. By mid-day, supercells along the [[bow echo]] in Iowa began to produce very strong winds, up to tennis ball-sized hail, and several mostly short-lived tornadoes.<ref name=Corfidi/> On [[Weather radar#Velocity|Doppler weather radar]], a large fast-moving [[mesocyclone]] associated of the track of a [[supercell]] was nearly in contact with the ground as it moved from southwest [[Boone County, Iowa|Boone County]] east-southeast across the northern and eastern parts of the [[Des Moines metropolitan area|Des Moines metro area]].<ref name=Corfidi/> |
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Over the [[Davenport, Iowa]] [[List of National Weather Service Weather Forecast Offices|NWS Weather Office]] area of responsibility, numerous reports of [[wind gust]]s ranging from 80 to 100 mph were received. The highest measured wind gust of {{convert|123|mph|km/h|0}} mph was reported in [[Washington, Iowa]] near coordinates {{coord|41.3|-91.7|region:US-IA|display=inline}}. This is the highest unofficial recorded wind gust in the history of the state of Iowa.<ref>{{cite web|url=https://www.weather.gov/dvn/ev19980629svr |title=June 29, 1998 Derecho|author= NWS Quad Cities IA/IL Weather Forecast Office|publisher=US [[National Weather Service]]|date=|accessdate=November 30, 2018}}</ref> |
Over the [[Davenport, Iowa]] [[List of National Weather Service Weather Forecast Offices|NWS Weather Office]] area of responsibility, numerous reports of [[wind gust]]s ranging from 80 to 100 mph were received. The highest measured wind gust of {{convert|123|mph|km/h|0}} mph was reported in [[Washington, Iowa]] near coordinates {{coord|41.3|-91.7|region:US-IA|display=inline}}. This is the highest unofficial recorded wind gust in the history of the state of Iowa.<ref>{{cite web|url=https://www.weather.gov/dvn/ev19980629svr |title=June 29, 1998 Derecho|author= NWS Quad Cities IA/IL Weather Forecast Office|publisher=US [[National Weather Service]]|date=|accessdate=November 30, 2018}}</ref> At the same moment, the area of light green in the radar display to the right, the velocities toward the weather radar (beneath orange arrow) represented a Doppler-estimated wind speeds in excess of {{convert|64|knot|mph}}, and the yellow circle are [[Convective storm detection#Radar|mesocyclone detections]]. |
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In Illinois, railroad cars where topples, steel power transmission towers were bent, and many buildings were seriously damages during the afternoon.<ref name=Corfidi/> By the evening into Indiana, hundreds of trees were uprooted in the [[Bedford, Indiana|Bedford]] and [[Indianapolis metropolitan area|Indianapolis]] areas, two semi-trailer trucks were blown off [[Interstate 65]] near [[Columbus, Indiana|Columbus]].<ref name=Corfidi/>. By late evening, damage into Kentucky was minimal, mostly limited to toppled trees and several blown off roofs.<ref name=Corfidi/> |
In Illinois, railroad cars where topples, steel power transmission towers were bent, and many buildings were seriously damages during the afternoon.<ref name=Corfidi/> By the evening into Indiana, hundreds of trees were uprooted in the [[Bedford, Indiana|Bedford]] and [[Indianapolis metropolitan area|Indianapolis]] areas, two semi-trailer trucks were blown off [[Interstate 65]] near [[Columbus, Indiana|Columbus]].<ref name=Corfidi/>. By late evening, damage into Kentucky was minimal, mostly limited to toppled trees and several blown off roofs.<ref name=Corfidi/> |
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Along with the long-lived derecho, 28 [[tornadoes]] were reported, one an '''[[Fujita scale|F2]]''' which injured 85 people in central [[Iowa]]. Over eight states, the derecho and associated tornadoes killed one person and injured 174.<ref name="severe plot">Data from the [[Storm Prediction Center]] archives, which are accessible through [http://www.spc.noaa.gov/software/svrplot2/ SeverePlot], free software created and maintained by John Hart, lead forecaster for the SPC.</ref> |
Along with the long-lived derecho, 28 [[tornadoes]] were reported, one an '''[[Fujita scale|F2]]''' which injured 85 people in central [[Iowa]]. Over eight states, the derecho and associated tornadoes killed one person and injured 174.<ref name="severe plot">Data from the [[Storm Prediction Center]] archives, which are accessible through [http://www.spc.noaa.gov/software/svrplot2/ SeverePlot], free software created and maintained by John Hart, lead forecaster for the SPC.</ref> |
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== See also == |
== See also == |
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Revision as of 00:22, 1 December 2018
 Path of the Corn Belt Derecho. | |
| Date(s) | June 29, 1998 |
|---|---|
| Duration | ~10 hours (12:00 PM-10:00 PM) |
| Track length | [convert: invalid number] |
| Peak wind gust (measured) | 123 mph (198 km/h; 55.0 m/s) (Washington, Iowa) |
| Largest hail | 2.5 in (6.3 cm) (Des Moines, Iowa) |
| Tornado count | 28 (Crawford County, Iowa) |
| Strongest tornado1 | F2 tornado |
| Fatalities | None |
| Damage costs | 125 million |
| Areas affected | Midwestern United States |
| 1Most severe tornado damage; see Fujita scale | |
The Corn Belt derecho was a derecho which affected a large area of the central United States on June 29, 1998. In the morning, thunderstorms, including a supercell, developed over South Dakota and tracked into central Iowa. As the thunderstorms reached central Iowa, a strong rear-inflow jet developed which caused the thunderstorm to take on a different characteristic, becoming a derecho. It traveled more than 600 miles in about ten hours, causing more than $125 million worth of widespread damage destruction, especially to crops, and was responsible for power outages to nearly a half a million people.[1]
Meteorological synopsis
Along a warm front in South Dakota, an unorganized area of thunderstorms formed by 9:00 a.m. CDT. They rapidly organized and spread along the front, moving east-southeast into northeast Nebraska. By midday, the storms reached northwestern and north central Iowa while forming an west-east band and assuming a bow echo shape.[1]
In the early afternoon, a second area of thunderstorms formed west of Des Moines and merged with the original bow echo line which accelerating east-southeast into Illinois by 4:00 p.m.. The line evolved into a classic large scale bow echo, showing a "book end vortex" on its northern end.[1] Damage, especially to crops and trees, became continuous from the Iowa border into Indiana as most of the damage was produced by strong straight-line winds on the leading edge of the gust front. Some embedded supercells, showing smaller-scale vortices on radars, produced narrower corridors of more intense damage, with measured wind gusts up to 110 mph.[1]
The derecho crossed central and southern Indiana during the early to mid evening while its highest wind gusts decreased somewhat compared with those observed earlier in the day. The system became a roughly west-east arc and turned more southward as it moved into Kentucky by late evening, dissipating gradually[1]
Impact
By the end of the morning, the thunderstorms produced hail up to the size of hen's eggs and locally damaging wind in Nebraska. By mid-day, supercells along the bow echo in Iowa began to produce very strong winds, up to tennis ball-sized hail, and several mostly short-lived tornadoes.[1] On Doppler weather radar, a large fast-moving mesocyclone associated of the track of a supercell was nearly in contact with the ground as it moved from southwest Boone County east-southeast across the northern and eastern parts of the Des Moines metro area.[1]
Over the Davenport, Iowa NWS Weather Office area of responsibility, numerous reports of wind gusts ranging from 80 to 100 mph were received. The highest measured wind gust of 123 miles per hour (198 km/h) mph was reported in Washington, Iowa near coordinates 41°18′N 91°42′W / 41.3°N 91.7°W. This is the highest unofficial recorded wind gust in the history of the state of Iowa.[2] At the same moment, the area of light green in the radar display to the right, the velocities toward the weather radar (beneath orange arrow) represented a Doppler-estimated wind speeds in excess of 64 knots (74 mph), and the yellow circle are mesocyclone detections.
In Illinois, railroad cars where topples, steel power transmission towers were bent, and many buildings were seriously damages during the afternoon.[1] By the evening into Indiana, hundreds of trees were uprooted in the Bedford and Indianapolis areas, two semi-trailer trucks were blown off Interstate 65 near Columbus.[1]. By late evening, damage into Kentucky was minimal, mostly limited to toppled trees and several blown off roofs.[1]
Along with the long-lived derecho, 28 tornadoes were reported, one an F2 which injured 85 people in central Iowa. Over eight states, the derecho and associated tornadoes killed one person and injured 174.[3]
See also
References
- ^ a b c d e f g h i j Corfidi, Stephen. "The "Corn Belt Derecho" of June 1998". NOAA. Retrieved November 30, 2018.
- ^ NWS Quad Cities IA/IL Weather Forecast Office. "June 29, 1998 Derecho". US National Weather Service. Retrieved November 30, 2018.
- ^ Data from the Storm Prediction Center archives, which are accessible through SeverePlot, free software created and maintained by John Hart, lead forecaster for the SPC.
- Ashley, Walker S.; T.L. Mote; M.L. Bentley (Sep 2007). "The extensive episode of derecho-producing convective systems in the United States during May and June 1998: A multi-scale analysis and review". Meteorol. Appl. 14 (3): 227–44. Bibcode:2007MeApp..14..227A. doi:10.1002/met.23.
External links
- [1] Storm Prediction Center's 'About Derechos' web page summary of the event by Stephen Corfidi
- NWS Quad Cities overview
Copy from the above referenced website.
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